Fill correct file name to OpDebugFunction and add line info for parameters' OpDebugDeclare

[qingyuanzNV]

This patch fixes:

1. OpDebugFunction's file entry should be the correct file instead of always main file
2. OpDebugDeclare and OpDebugValue should be now attributed with an OpDebugLine pointing to the function definition line.

[arcady-lunarg]

Could you add a test with debuginfo and include files? I think this will help demonstrate your change's functionality.

[qingyuanzNV]

It turns out it's a non-trivial effort to add a test for this. I have to change the test infrastructure to pass in a customized includer and optionally pass in the shader name for non-semantic debug.

Btw, I noticed that the source text for main file is wrong for the test result. I didn't fix it because it looks like an old issue, not a regression by this PR.

[qingyuanzNV]

Change to draft. The test infra part is increasingly complicated, and I think it's worth a dedicated PR. I'd like to extract the test infra part and commit that first.